Reflex-klystron



June 7, 1960 B. B. VAN IPEREN 2,939,999

REFLEx-KLYSTRON Filed May 20, 1958 INVENTOR BERNARDUS BASTIAAN VAN IPEREN its States Patent "W REFLEX-ELYSTRON Bernardus Bastiaan van Iperen, Eindhoven, Netherlands, assignor to North American Philips Company, Inc., New York, N.Y., a corporation of Delaware Filed May 20, 1958, Ser. No. 736,635

Claims priority, application Netherlands June 13, 1957 Claims. (Cl. 315-522) The present invention relates to reeX-klystrons, the reliector part of which is connected to a movable cavity resonator wall which is adjustable by means of a bent over plate spring secured on the one hand to the wall comprising the movable part and on the other hand lto the reflector-containing part of the tube, a tuning lever being provided between the open end of the spring.

This construction permits reileX-klystrons to be tuned in a simple and inexpensive manner.

In respect of the relieX-klystrons for millimetre waves, the conventional construction has a disadvantage in that the displacement at right angles to the beam axis of the reflector and the associated aperture of the cavity resonajtor wall, in conjunction with the small size of this aperture, is considerable in tuning the tube, so that its operation is adversely affected.

The present invention has for its object to provide a construction which does not suffer from this disadvantage.

ln a reiiex-klystron, the reilector portion of which is secured to a movable wall of the resonant cavity, which is adjustable by bending a folded plate spring secured on the one hand to the wall comprising the movable part and on the other hand to the part of the tube containing the reector, and in which a tuning lever is provided between the open end of the folded plate spring, the plate spring is, in accordance with the invention, bent in L-form so that, in tuning the tube, the reector part is substantially moved in the axis of the tube.

By bending over the plate spring, the point about which the reiiector portion pivots in tuning, is displaced in .the direction of the axis and about into the plane of the movable wail portion. In this manner it is achieved that, to a vrst degree of approximation, no lateral displacement occurs. p

In order that the invention may be readily carried into effect, an example will now be described in detail with reference to the accompanying drawing, in which the sole ligure is a sectional view of arretiex klystron according to the invention.

The reference numeral 1 designates a fernicocylnder with a glass head 2 comprising a number of lead-through conductors 3 having secured to them a focussing electrode 4 and a cathode 5 respectively, the latter being adjusted in the focussing electrode by means of a ceramic block 6. The resonant cavity 7 is formed in a copper block S by walls 9 and 10 having rotation symmetry. The Wall 10 is iiexible and has secured to it a fernicomember 11 carrying, through an insulating hood 12, the reflector-electrode 13. The apertures of the walls 9 and 10 are only a few tenths of a mm. wide, so that lateral displacements of the reector part comprising the movable wall relatively to the stationary part renders correct reection of the electron beam impossible. The fernicomember l is clamped in a steel plate 14 the at upper side of which is pressed against 'the at lower side of the plate 15 which in turn is secured to the upper blade 16 of the plate spring, the lower blade 17 of which is clamped Patented June 7, 1960 to the block 8 by means of bolts. The bolts 18 clamping together the plates 14 and 15 extend through wide apertures of the plate 15 and the spring blade 16. For this purpose the bolts 18 are provided with W-ashers 19. Adjustment of ,the plate spring is efected by means of a toggle lever 20 which is linematically supported between the centre of rotation 21, the end of .thebolt 22 and the end of the bolt 23 serving :for coarse tuning :and iine tuning respectively. In this -form of the plate spring, the member ll'rotates substantially about the point 25 on tuning the tube, so that the movement of thepart 11 and consequently of the opening of ,the cavity wall on the reector side is axial to a first degree of approximation.

Should the plate springA have the 4form indicated in dotted lines 26, the member 11 would turn about point 27, which would involve a strong lateral displacement of the movable wall portion.

As stated before, the plates 14 and 15 have surfaced contact surfaces and the fbolts 18 extend through wide holes of the plate /15 and the spring plate 16. This has the following meaning. Theplate 14 is bi-par-tite and comprises bolts (not shown). Together with the plate spring it is slipped in open state over the reector part 11 after pumping the tube. In elect, it is not feasible to provide :the tube with the tuning device during pumping and heating up the tube. After securing the spring blade Vi7 to the block S, the plate 14 is clamped about the part 11 at as short as possible a distance from theY plate 15, and subsequently the plate `14 and 15 are caused .to extend parallel .to each other by -turning the part 11 about the aperture ofthe wall portion 10 as a centre. Lateral displacement is not allowed. Subsequently, the bolts 18 are tightened and then exclusively an axial movement of the part 11 occurs.

What is claimed is:

1. A reflex klystron comprising means to generate an electron beam, means o support the electron beam generating means including a flexible diaphragm having an aperture for the passage of the electron beam, a retiector electrode, means to support said reector electrode including a tubular envelope surrounding the rellector electrode and closed at one end by a llexible diaphragm having an aperture therein for the passage of the electron beam, means to support the lilexible diaphragme spaced apart to thereby delinea resonant cavity, a plate spring comprising two substantially parallel L-shaped portions joined by a bend at one end remote from the reector electrode, one of said portions being secured to said tubular member and the other of said portions being secured to said exible diaphragm support means, and means yto adjust the position of the plate spring to thereby align the reiiector electrode and the apertures in the exible diaphragms with the electron beam generating means.

2. A reiiex klystron comprising means ,to generate an electron beam, means to support the electron beam generating means including a flexible diaphragm having an aperture for the passage of the electron beam, a redector electrode, means to support said reflector electrode including a tubular envelope surrounding the reector electrode and closed at one end by a flexible diaphragm having an aperture therein for the passage of the electron beam, means to support the ilexible diaphragms spaced apart to thereby define a resonant cavity, an L-shaped plate spring having two spaced parallel at portions one of which is secured to said tubular envelope and the other to said tiexible diaphragm support means and having its bend remo-te from the rciiector electrode, and

'means -to adjust the position ofthe plate spring .to thereby align the reflector electrode and the apertures in the iiexible diaphragme with the electron beam generating means.

13. A reflex klystron comprising means to generate an electron beam, means to support the'eleotron beam generating means including a exible Vdiaphragm having an A aperture for the passage of the electron beam, areector electrode, means to support said reector electrode im cluding a tubular envelope closed at one end by a iexible diaphragm securedrto said supporting means for said electron beam; generating means and having an aperture therein forrthe passage of the electron beam, the flexible daphragms being spaced apart and defining 4a resonant cavity, an L-shaped plate spring having two spaced paral- Vlei:flat'portions one-oi'which s Vsecured to said tubular. Y envelope and the other toV said supporting means forrsaid electron beamrgenerating means and having its bend rerrnoterffrorn thereector electrode,y and means to adjust inciruding a tubular envelope closed at one end by a fleXi-V Y bie-'diaphragm seured yto said supporting means .for said electron beam generating means and having an aperture therein for the passage. of Ithe electron 'beam the exible diaphragms being, spaced apart and defining a resonant avity, an.. L-shaped plate spring having two at parallel spaced lpo rtions,;1`1rst clamping means; securing one ofV said at portions to said tubular envelopey and seeond clamping means securing the other of said at portions i Y to said supporting means forV saidelec-tron beam generating meansfandY having its'bend remote `from the re- Y 1 ector electrode, 'and means Vto adjust the position of the plate spring to lthereby align the reeotor electrode and 4the apertures in theexible diaphragmsl with the electro-n beam generating meansYV Y Y5. A reflex klystron eomprisingY means to generate an `electron lbeam, means `to support'the electron beam generating means including a rst plate-likefmember having a flexible diaphragm Vwith an aperture therein for the passage of the electron 'bearrrg a reflector electrode, means `to support said reflectorV electrode including Va tubular envelope closed at one end lby aV exibie'diaphragm secured vto, said supporting means for saidrelectron beam generating means and YVhaving an aperture therein for the passage of the electron beam, the jexible -diaphragms be- YingV spaced "apart Vand deiningya resonant cavity, an

Lrshapedrplate yspring having two atrparallelspaced portions Connected at ,the ends thereof remote vf'ro'mth'e releetor electrodeby a YU-.shapediportiom a second' at plate-like member having a at surface opposing one of the -at portionsof the` spring member andrclamped thereto and to said tubular envelope, means to clamp said iirst plate-like member to the other of said flat por- Y tions ofY said spring member, Vand means to adjust the position of the plate spring -to Ythereby align the reector electrode and'the apertures in thegilexible diaphragms with the electron beam generating means. j Y ,Y

References- Cited in the tile ofthis patent?A V UNrTEDY STATES PATENTS f UNITED STATES PATENT OFFICE CERTIFICATE OF 'CORRECTION Patent No., 2,913,9999 June 7, 1960 Bernardus Bastiaan van lperen It is herebjr certified that error appears n bhe-printed specification of the above `numbered patent requiring correction and 'that the said Letters Patent should read as corrected below.

Column 2, line 29, for "plate", second occurrence? read plates line 37, for "means o support" read means to support Signed and sealed this 4th day of April 1961.,

(SEAL) Attest: ERNEST W. SWIDER m f im ARTHUR W. CROCKER a Attesting Ocer Acting Commissioner of Patents 

